.page-about {
  --about-arc: 160px;
  color: var(--mist);
}

.page-about .breadcrumb {
  padding: 22px 0 6px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 36px;
  padding: 14px 0 54px;
  background-image:
    radial-gradient(640px 360px at 6% 0%, rgba(43, 232, 198, .10), transparent 70%),
    radial-gradient(520px 300px at 96% 12%, rgba(255, 142, 60, .08), transparent 72%);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-size: clamp(36px, 8.6vw, 68px);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -.015em;
  color: var(--white);
}

.page-about .about-hero__text {
  margin: 22px 0 0;
  max-width: 46ch;
  color: var(--mist);
}

.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
}

.page-about .about-jump__item {
  text-decoration: none;
  color: var(--cyan);
  border-color: rgba(43, 232, 198, .55);
}

.page-about .about-jump__item:hover,
.page-about .about-jump__item:focus-visible {
  background: var(--cyan-soft);
  color: var(--white);
  border-color: var(--cyan);
}

.page-about .about-figures {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 18px;
  align-content: start;
}

.page-about .about-figures .stat {
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.page-about .about-figures .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 6.4vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--white);
}

.page-about .about-figures .stat__label {
  display: block;
  margin-top: 9px;
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--slate);
}

/* ---------- 满宽视觉 ---------- */
.page-about .about-photo {
  margin: 0 0 8px;
}

.page-about .about-photo img,
.page-about .about-axis img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--r-card);
  object-fit: cover;
}

.page-about .about-photo img {
  aspect-ratio: 2 / 1;
}

.page-about .about-axis img {
  aspect-ratio: 7 / 3;
}

/* ---------- 章节通用 ---------- */
.page-about .section {
  padding: 52px 0;
}

.page-about .about-head {
  max-width: 60ch;
}

.page-about .about-head h2 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-size: clamp(26px, 5.4vw, 40px);
  font-weight: 800;
  letter-spacing: -.01em;
  line-height: 1.1;
  color: var(--white);
}

.page-about .about-head .lede {
  margin: 16px 0 0;
  color: var(--mist);
}

.page-about .about-band {
  position: relative;
  height: 72px;
  max-width: 1280px;
  margin: 0 auto;
  overflow: hidden;
  pointer-events: none;
}

.page-about .about-band::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 34px;
  width: min(1000px, 130%);
  height: 200px;
  transform: translateX(-50%);
  border-top: 1px solid var(--line-soft);
  border-radius: 0 0 50% 50% / 0 0 var(--about-arc) var(--about-arc);
}

/* ---------- 发展历程 ---------- */
.page-about .about-axis {
  margin: 34px 0 0;
}

.page-about .about-eras {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  display: grid;
  gap: 44px;
}

.page-about .about-era {
  position: relative;
  padding-left: 30px;
}

.page-about .about-era::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 22px;
  bottom: -44px;
  width: 1px;
  background: var(--line);
}

.page-about .about-era:last-child::before {
  display: none;
}

.page-about .about-era::after {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--grass);
  box-shadow: 0 0 0 4px rgba(89, 217, 127, .15);
}

.page-about .about-era__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .08em;
  color: var(--orange);
}

.page-about .about-era__body h3 {
  margin: 10px 0 0;
  font-size: 19px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-era__body p {
  margin: 10px 0 0;
  max-width: 58ch;
  color: var(--slate);
}

/* ---------- 处理流程 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  column-gap: 18px;
  padding: 22px 12px 22px 0;
  border-top: 1px solid var(--line-soft);
  transition: background .2s ease;
}

.page-about .about-step:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-step:hover {
  background: linear-gradient(90deg, rgba(43, 232, 198, .07), transparent 62%);
}

.page-about .about-step__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1.35;
  color: var(--cyan);
}

.page-about .about-step__body h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-step__body p {
  margin: 8px 0 0;
  max-width: 56ch;
  color: var(--slate);
}

.page-about .about-expand {
  margin: 32px 0 0;
  padding: 18px 20px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background: var(--ink-800);
}

.page-about .about-expand .expand__trigger {
  font-size: 17px;
  font-weight: 600;
  color: var(--cyan);
  background: none;
  border: 0;
  padding: 0;
  text-align: left;
  cursor: pointer;
}

.page-about .about-expand .expand__panel p {
  margin: 14px 0 0;
  max-width: 58ch;
  color: var(--slate);
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-coverage__grid {
  display: grid;
  gap: 32px;
  margin-top: 34px;
}

.page-about .about-scope {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-scope li {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr);
  column-gap: 14px;
  font-size: 16px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-scope li::before {
  content: "";
  width: 7px;
  height: 7px;
  margin-top: 11px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .about-scope__aside {
  margin: 22px 0 0;
  padding: 18px 20px;
  border-left: 2px solid var(--amber);
  border-radius: 0 var(--r-card) var(--r-card) 0;
  background: rgba(255, 178, 77, .07);
  font-size: 15px;
  color: var(--slate);
}

.page-about .about-scope__aside a {
  color: var(--cyan);
}

.page-about .about-map {
  margin: 0;
  position: relative;
}

.page-about .about-map img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--r-card);
  border: 1px solid var(--line);
  object-fit: cover;
}

/* ---------- 团队分工 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-role {
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background: var(--ink-800);
  transition: border-color .18s ease, transform .18s ease;
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .about-role__key {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--orange);
}

.page-about .about-role__name {
  margin: 10px 0 0;
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-role__note {
  margin: 8px 0 0;
  font-size: 15px;
  color: var(--slate);
  opacity: .78;
  transition: opacity .18s ease;
}

.page-about .about-role:hover .about-role__note,
.page-about .about-role:focus-within .about-role__note {
  opacity: 1;
}

/* ---------- 更新与修订 ---------- */
.page-about .about-promise__list {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 26px;
}

.page-about .about-promise__list li {
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.page-about .about-promise__list h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-promise__list p {
  margin: 10px 0 0;
  max-width: 56ch;
  color: var(--slate);
}

.page-about .about-links {
  list-style: none;
  margin: 38px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-links a {
  display: inline-block;
  color: var(--cyan);
  font-size: 16px;
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 232, 198, .35);
  padding-bottom: 2px;
}

.page-about .about-links a:hover,
.page-about .about-links a:focus-visible {
  color: var(--white);
  border-bottom-color: var(--white);
}

.page-about .about-base {
  margin: 34px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line-soft);
  font-size: 14px;
  color: var(--slate);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 56px;
    align-items: start;
    padding: 24px 0 72px;
  }

  .page-about .about-figures {
    margin-top: 22px;
  }

  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px 28px;
  }
}

@media (min-width: 900px) {
  .page-about .section {
    padding: 84px 0;
  }

  .page-about .about-coverage__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 420px);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-eras {
    gap: 52px;
  }

  .page-about .about-era {
    display: grid;
    grid-template-columns: 132px minmax(0, 1fr);
    column-gap: 64px;
    padding-left: 0;
  }

  .page-about .about-era::before {
    left: 164px;
    top: 8px;
    bottom: -52px;
  }

  .page-about .about-era::after {
    left: 159px;
    top: 4px;
  }

  .page-about .about-era__year {
    text-align: right;
    font-size: 16px;
    padding-top: 0;
  }

  .page-about .about-era__body h3 {
    margin-top: 0;
  }

  .page-about .about-step {
    grid-template-columns: 72px minmax(0, 1fr);
    column-gap: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-step,
  .page-about .about-role__note {
    transition: none;
  }

  .page-about .about-role:hover {
    transform: none;
  }
}
<<<END>>>